So, this means, I stop the engine off at the examinors request, pull out mixture and throttle, at no less than 2000 ft, get the aeroplane into a glide, put mixture to rich, open throttle a quarter, prime once and lock prime, turn key and hope the engine fires up, fly away?..................
Okay, it's established you don't have to do this on the SEP exam.
But, just in case you have to do this for real, someday, for instance because you mismanaged the fuel in your PA-28 and ran one tank dry:
As long as you maintain a reasonable speed (best glide will do), the engine will windmill. Usually at an RPM far greater than what the starter motor could deliver. Also, the engine is still warm (if you react quickly enough) so there's no need to prime. Just make sure mixture is rich, fuel selector is on a non-empty tank and the electric fuel pump is on. Leave throttle where it is and the engine will catch again.
I fly aerobatics in an R2160 without an inverted flight system and we do push negative g's for short periods. This interrupts the fuel flow to the engine, floods the carbs etc, so the engine will stop producing power. But it does keep on windmilling. All we do is pull the throttle to avoid the 100LL smell from the overflowing carbs. As soon as positive g is restored, the engine will catch again in a second or two. Should the engine stop completely then once positive g is established all we need to do is flick the starter switch quickly. As soon as the engine is past that first compression the airflow will ensure that the engine will windmill again.
And if you don't believe me, here's something that you could try (with an instructor on board, obviously). In level cruise, at a safe height (and 2000' seems very low to me), pull the mixture all the way back. Engine will stop producing power and windmill. Trim for best glide. Push mixture all the way in again. Engine will work again. Simple. (Don't do this too often though. The cooling/heating cycle associated with this is not good for the engine.)